Having issues getting Quartus Prime Standard Edition 18.1 to recognize my Stratix V GX FPGA board. Whenever I go to the hardware setup, there is no hardware listed and when I go to add new hardware the Auto Detect doesn't work, any ideas?

Is it a dev kit like this one: https://www.intel.com/content/www/us/en/programmable/products/boards_and_kits/dev-kits/altera/kit-sv-gx-host.html

You use USB to program the device through the on-board USB Blaster (USB-to-JTAG bridge), not ethernet. Ethernet Blaster is an Ethernet-to-JTAG-bridge. Are you saying you have an Ethernet Blaster (separate hardware) connected to the 10-pin JTAG interface of the device?

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That ethernet is for an ethernet connection to a design already programmed into the device, not for device programming. Like you say, you need a USB cable to program the device.

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Do you know what specific type of USB cable I need?

If it's the board I linked to, it needs USB-A to micro B. See the reference manual:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/manual/rm_svgx_fpga_dev_board.pdf

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